West Coast police say a Facebook page launched a year ago to alert people to the whereabouts of road checkpoints has overstepped the mark.
The page highlights the location of checkpoints and speed cameras, and is augmented with police gossip. It currently has 1503 'likes'.
Initially, West Coast police area commander Inspector John Canning was relaxed about it because he saw it more as helping to get people to slow down, rather than avoid detection.
However, he said today some of the postings that were being made on the page included hate messages toward police and unverified information obtained from scanners.
"While it is not illegal to have a police scanner, it is illegal to use the information heard on it in a public arena - and that it what is happening on this page," Mr Canning said.